import random
import curses

s = curses.initscr()  # 初始化屏幕
curses.curs_set(0)  # 设置光标为0
sh, sw = s.getmaxyx()  # 获得高宽
w = curses.newwin(sh, sw, 0, 0)  # 使用高宽创建一个新窗口,从左上角开始
w.keypad(1)  # 接受键盘输入
w.timeout(100)

# 创建蛇的初始位置
snk_x = sw / 4
snk_y = sh / 2
# 最初的蛇身部位
snake = [
    [snk_y, snk_x],
    [snk_y, snk_x - 1],
    [snk_y, snk_x - 2]
]

food = [sh / 2, sw / 2]  # 创建食物
w.addch(int(food[0]), int(food[1]), curses.ACS_PI)

key = curses.KEY_RIGHT

while True:
    next_key = w.getch()
    key = key if next_key == -1 else next_key

    if snake[0][0] in [0, sh] or snake[0][1] in [0, sw] or snake[0] in snake[1:]:
        curses.endwin()
        quit()

    new_head = [snake[0][0], snake[0][1]]

    if key == curses.KEY_DOWN:
        new_head[0] += 1
    if key == curses.KEY_UP:
        new_head[0] -= 1
    if key == curses.KEY_LEFT:
        new_head[1] -= 1
    if key == curses.KEY_RIGHT:
        new_head[1] += 1

    snake.insert(0, new_head)

    if snake[0] == food:
        food = None
        while food is None:
            nf = [
                random.randint(1, sh - 1),
                random.randint(1, sw - 1)
            ]
            food = nf if nf not in snake else None
        w.addch(int(food[0]), int(food[1]), curses.ACS_PI)
    else:
        tail = snake.pop()
        w.addch(int(tail[0]), int(tail[1]), ' ')

    w.addch(int(snake[0][0]), int(snake[0][1]), curses.ACS_CKBOARD)
